import pandas as pd

file = "path.csv"
filedata = pd.read_csv(file)
Items = []
Items.append(filedata['Product_Name'][0])

for i in range(1,len(filedata)):
    item = filedata['Product_Name'][i]

    if item not in Items:
        Items.append(item)

dic = {'Product_Name': Items}
I = pd.DataFrame(dic)
I.to_csv('Items.csv',index = False)    
